As some of you know i converted a MUGEN MBX4 to BL. I'm saving money to buy a 7xl. I have a 9L or lehner 3100xl for use as a temperary motor, on either 12 or 14 cells. Which do you guys think would be a better choice for a temperary motor ?. Also the spur is 46t mod1 so recomend a pinion size to. Thank's